Creeping Buttercup

Creeping buttercup (Ranunculus repens) is the only common buttercup that spreads via creeping above-ground runners (stolons) that root at the nodes to form dense, independent daughter plants. This invasive growth habit, paired with its unique leaf and stem features, sets it firmly apart from other meadow varieties.

Key Distinguishing Features

• Rooting Runners: Unlike the upright Meadow Buttercup or the single-clump Bulbous Buttercup, the Creeping Buttercup spreads horizontally, creating dense, difficult-to-remove mats across lawns and damp soil.

• The "Stalked" Terminal Leaflet: If you look closely at its divided, three-lobed leaves, the central (terminal) leaflet is distinctly stalked. In contrast, the terminal leaflet on the Meadow Buttercup attaches directly to the leaf base (sessile).

• Grooved Flower Stems: If you roll the flower stalk (peduncle) between your fingers, you will feel vertical ridges and furrows. The Meadow Buttercup has a completely smooth and round stalk.

• Erect Sepals: Immediately beneath the glossy yellow petals are five small green sepals. The Creeping Buttercup's sepals press closely against the petals (erect), whereas the Bulbous Buttercup’s sepals curl distinctly backward and downwards.

Fascinating Characteristics

• Mirrored Petals: The iconic mirror-like shine of the buttercup is not just for attracting pollinators. The petal has a smooth upper surface and a special air-filled layer beneath it that acts as a reflector. This gloss is also used for thermoregulation to keep the flower's reproductive organs warm in cooler weather.

• Self-Defense Chemistry: Like other buttercups, the Creeping Buttercup contains a compound called ranunculin. When the plant is crushed or bruised, this breaks down into protoanemonin, a toxic oil that causes blistering and severe stomach irritation to livestock. Consequently, cattle tend to avoid it in pastures.